Allegro Industries ACS712 User manual

Brand: Allegro Industries

Model: ACS712

Type: User manual

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User Manual

For

ACS712 20A Range Current Sensor

Module for Arduino(ME067)

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Description:

The Allegro® ACS712 provides economical and precisesolutions for AC or DC current

sensing in industrial,commercial, and communications systems. The device package

allows for easy implementation by the customer.Typical applications include motor

control, load detection and management, switched-mode power supplies, and

overcurrent fault protection.

The device consists of a precise, low-offset, linear Hall sensor circuit with a copper

conduction path located near the surface of the die. Applied current flowing through

this copper conduction path generates a magnetic field which is sensed by the

integrated Hall IC and converted into a proportional voltage. Device accuracy is

optimized through the close proximity of the magnetic signal to the Hall transducer. A

precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS

Hall IC, which is programmed for accuracy after packaging.

The output of the device has a positive slope (>VIOUT(Q)) when an increasing current

flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and

4), which is the path used for current sensing.

Specification

 Power supply:5V

 Current Sensor Chip: (20A)ACS712ELC-20A

 Module can measure the+/-20A Current, corresponding to the analog output

100mV / A

 no detect current passed,the output voltage is VCC / 2

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This module has three ranges for different sensor chip:

Pinout:

Tutorial:

What You Will Need?

 An Arduino UNO

 An ACS712 Current Sensor Module

 A Load

 A Power Source

 A Bench Supply

The ACS712 Sample Project Schematic

The drawing below shows I hooked things up.

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You can copy and paste the code you see below.

****** Code Begin******

Measuring Current Using ACS712

const int analogIn = A0;

int mVperAmp = 185; // use 100 for 20A Module and 66 for 30A Module

int RawValue= 0;

int ACSoffset = 2500;

double Voltage = 0;

double Amps = 0;

void setup(){

Serial.begin(9600);

}

void loop(){

RawValue = analogRead(analogIn);

Voltage = (RawValue / 1024.0) * 5000; // Gets you mV

Amps = ((Voltage - ACSoffset) / mVperAmp);

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Serial.print("Raw Value = " ); // shows pre-scaled value

Serial.print(RawValue);

Serial.print("\t mV = "); // shows the voltage measured

Serial.print(Voltage,3); // the '3' after voltage allows you to

display 3 digits after decimal point

Serial.print("\t Amps = "); // shows the voltage measured

Serial.println(Amps,3); // the '3' after voltage allows you to display

3 digits after decimal point

delay(2500);

}

****** Code End******

Allegro Industries ACS712 User manual

Allegro Industries ACS712 User manual

Allegro Industries ACS712 User manual

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